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Dividends (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Dec. 05, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Jan. 30, 2014
Subsequent Event [Member]
Dividends [Abstract]            
Dividend per share paid during period $ 0.3545     $ 1.062    
Dividends paid during period $ 70,600,000     $ 210,322,000 $ 204,592,000  
Subsequent Event [Line Items]            
Dividends declared per common share   $ 0.3545 $ 0.3520 $ 1.0620 $ 1.0530 $ 0.3550
Total amount of expected dividend payment           $ 70,700,000